class EventArgs (View source)

EventArgs is the base class for classes containing event data.

This class contains no event data. It is used by events that do not pass state information to an event handler when an event is raised. The single empty EventArgs instance can be obtained through {@link getEmptyInstance}.

Methods

static EventArgs
getEmptyInstance()

Gets the single, empty and immutable EventArgs instance.

Details

static EventArgs getEmptyInstance()

Gets the single, empty and immutable EventArgs instance.

This instance will be used when events are dispatched without any parameter, like this: EventManager::dispatchEvent('eventname');

The benefit from this is that only one empty instance is instantiated and shared (otherwise there would be instances for every dispatched in the abovementioned form).

Return Value

EventArgs

See also

EventManager::dispatchEvent